iccToXml emits ISO-8859-1 bytes (0xB0) in XML

[xsscx]

Maintainer Repro

Wed Dec 31 09:47:51 PM UTC 2025

tl;dr iccToXml created XML 1.0 document, ISO-8859 text, with CRLF, LF line terminators

grep -n --text "ObserverAngle" ub-icDataBlockType-IccTagBasic_h-L1299.xml | xxd -g1
00000000: 31 35 33 37 3a 4d 45 41 53 55 52 45 4d 45 4e 54  1537:MEASUREMENT
00000010: 5f 53 4f 55 52 43 45 09 22 49 6c 6c 75 6d 69 6e  _SOURCE."Illumin
00000020: 61 74 69 6f 6e 3d 44 35 30 09 4f 62 73 65 72 76  ation=D50.Observ
00000030: 65 72 41 6e 67 6c 65 3d 32 b0 09 57 68 69 74 65  erAngle=2..White
00000040: 42 61 73 65 3d 41 62 73 09 46 69 6c 74 65 72 3d  Base=Abs.Filter=
00000050: 4e 6f 22 0d 0a                                   No"..

Summary

The output from iccToXml contains byte 0xB0 (ISO-8859-1 degree sign) where UTF-8 requires 0xC2 0xB0, making the XML invalid despite declaring encoding="UTF-8".

Step 1. Get PoC

cd Testing
wget https://github.com/xsscx/Commodity-Injection-Signatures/raw/refs/heads/master/graphics/icc/ub-icDataBlockType-IccTagBasic_h-L1299.icc

Step 2. file ub-icDataBlockType-IccTagBasic_h-L1299.icc

Expected Output of file command

ub-icDataBlockType-IccTagBasic_h-L1299.icc: Microsoft color profile 2.4, type APPL, CMYK/Lab-prtr device by LOGO, 2638280 bytes, 16-5-2006 13:56:05 "Xeikon FA Uncoated 320%"

Step 3. iccToXml ub-icDataBlockType-IccTagBasic_h-L1299.icc ub-icDataBlockType-IccTagBasic_h-L1299.xml

Unexpected Output for icc -> xml

IccProfLib/IccTagBasic.h:1299:45: runtime error: load of value 16777216, which is not a valid value for type 'icDataBlockType'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior IccProfLib/IccTagBasic.h:1299:45
IccXML/IccLibXML/IccTagXml.cpp:1730:7: runtime error: load of value 16777216, which is not a valid value for type 'icDataBlockType'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Testing/tmp/iccDEV/IccXML/IccLibXML/IccTagXml.cpp:1730:7
XML successfully created

Step 4. file ub-icDataBlockType-IccTagBasic_h-L1299.xml

Unexpected Output of file command

ub-icDataBlockType-IccTagBasic_h-L1299.xml: XML 1.0 document, ISO-8859 text, with CRLF, LF line terminators

Create ICC Profile from XML

Step 5. iccFromXml ub-icDataBlockType-IccTagBasic_h-L1299.xml ub-icDataBlockType-IccTagBasic_h-L1299-from-xml.icc

Unexpected Output from iccFromXml

ub-icDataBlockType-IccTagBasic_h-L1299.xml:1537: parser error : Input is not proper UTF-8, indicate encoding !
Bytes: 0xB0 0x09 0x57 0x68
MEASUREMENT_SOURCE      "Illumination=D50       ObserverAngle=2�        WhiteBase=Abs   Filter=No"
                                                               ^
Unable to Parse 'ub-icDataBlockType-IccTagBasic_h-L1299.xml'

Expected Output

• Proper UTF-8

Output from iccToXml

ub-icDataBlockType-IccTagBasic_h-L129901.xml